cloudy-raytracer/renderer/simplerenderer.cpp

#include "camera/camera.h"
#include "renderer/simplerenderer.h"
#include "scene/scene.h"
#include <iostream>
#include <chrono>
#include <iomanip>
#include <thread>

Texture SimpleRenderer::renderImage(Scene const &scene, Camera const &camera, int width, int height) {
  Texture image(width, height);

  // Setup timer
  std::chrono::steady_clock::time_point start, stop;

  // Reset Ray counting
  Ray::resetRayCount();

  // Super-hacky progress bar!
  std::cout << "(SimpleRenderer): Begin rendering..." << std::endl;
  std::cout << "| 0%";
  int const barSizeGoal = 100;
  int const stepSize = width / barSizeGoal;
  for (int i = 0; i < width / stepSize - 3 - 5; ++i)
      std::cout << " ";
  std::cout << "100% |" << std::endl << "|";
  int k = 0;

  // Start timer
  start = std::chrono::steady_clock::now();

    float const aspectRatio = static_cast<float>(height) / static_cast<float>(width);
    std::vector<std::thread> threads;
    threads.reserve(width);
    for (int x = 0; x < image.width(); ++x) {
        threads.emplace_back([&image, aspectRatio](auto camera, auto scene, int x) {
            for (int y = 0; y < image.height(); ++y) {
                Ray ray = camera->createRay((static_cast<float>(x) / image.width() * 2.0f - 1),
                                            -(static_cast<float>(y) / image.height() * 2 - 1) * aspectRatio);
                image.setPixelAt(x, y, clamped(scene->traceRay(ray)));
            }
        }, &camera, &scene, x);
    }
    for (auto &thread: threads) {
        thread.join();
        // Super hacky progress bar!
        if (++k % stepSize == 0) {
            std::cout << "=" << std::flush;
        }
    }

  // Stop timer
  stop = std::chrono::steady_clock::now();

  std::cout << "| Done!" << std::endl;

  // Calculate the Time taken in seconds
  double seconds = std::chrono::duration_cast<std::chrono::duration<double>>(stop - start).count();

  std::cout << "Time: " << seconds << "s" << std::endl;

  // Get the number of seconds per ray
  int rays = Ray::getRayCount();

  std::cout << "Paths: " << rays << std::endl;
  std::cout << "Paths per second: " << std::fixed << std::setprecision(0) << rays / seconds << std::endl;


  return image;
}